Cornelius Herman (“Neil”) Muller

It's the birthday of Cornelius Herman ("Neil") Muller, the American botanist and ecologist, who was born on this day in 1909.

Muller pioneered the study of allelopathy. Allelopathy occurs when one plant species release chemical compounds that affect another plant species.
Most Gardeners know that black walnut is an example of allelopathy. In addition to the leaves, black walnut trees store allopathic chemicals in their buds, in the hulls of the walnuts, and in their roots.